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Created on 04.16

Successful Early Warning of Shuiyinpan Landslide in Puge County, Sichuan​

1. Site Overview

Location: Huashan Township, Hongxing Village Group 2 (Coordinates: 102°35′25″E, 27°25′20″N)
Monitoring Personnel: Liu Hong (Contact: +86 130 8925 4172)
At-Risk Population: 16 households (90 residents)
Monitoring System:
  • 2 wire extensometers
  • 1 rainfall monitoring station
  • 1 early warning broadcast system

2. Incident Timeline

June 9-10, 2020 Extreme Rainfall Event
Time
Event Description
22:05
Light rain began
22:40
Rainfall intensified to heavy storm
22:50
Rainfall station triggered yellow alert; broadcast system activated
23:20
Red alert activated; monitoring officer initiated door-to-door notifications
23:37
Extensometer #2 detected deformation
23:55
Extensometer yellow alert triggered
00:10 (June 10)
Red alert activated; evacuation warning broadcasted
00:50
Rainfall ceased (Total accumulation: 140.2mm)
Key Outcomes:
  • 80-minute advance warning achieved
  • 100% at-risk population received alerts
  • Zero casualties or property damage

3. System Performance

Post-event Equipment Status:
  • Rainfall station: Fully operational
  • Extensometer #1: Normal operation
  • Extensometer #2: Sensor damaged by landslide (replaced)
  • Broadcast system: Continuous alert transmission confirmed

4. Landslide Characteristics

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From the above hourly rainfall bar chart and minute rainfall bar chart, it can be clearly seen that this rainfall began at 22:05 on June 9, 2020, and lasted until the early morning of June 10, 2020. The entire process saw continuous rainfall of over 140mm, with the rainfall reaching 140.2mm from 22:30 on June 9, 2020 to 00:50 on June 10, 2020.

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As can be seen from the above figure, the crack underwent a sharp change before the landslide occurred. It roughly started at 23:37 on June 9, 2020, and lasted until the moment of the landslide (around 00:10 on June 10). The deformation duration was about 30 minutes, and the deformation rate was as high as 288mm/d. Moreover, the time of its occurrence has a strong correlation with the period before and after the formation of this rainfall.

5. Verification & Analysis

Field Observations:
  • Secondary landslide risk identified (requires further assessment)
  • Extensometer #2 damage confirmed due to anchor point displacement
Monitoring Data Correlation:
  • Complete data chain from rainfall → deformation → failure
  • Precise temporal alignment between:
a) Rainfall intensity peaks
b) Crack development
c) Alert triggers

6. Conclusion

This event demonstrated:
  1. System Effectiveness: Integrated monitoring successfully predicted slope failure 80 minutes in advance
  2. Alert Reliability: Local mesh network ensured real-time warning dissemination
  3. Human Factor: Monitoring officer's proactive response complemented automated systems
  4. Data Quality: Clear precursor signals enabled accurate risk assessment
The Shuiyinpan landslide early warning represents a model case of successful geohazard mitigation through integrated technical systems and community preparedness.
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